Classifying expenses
Needs can include basic housing, food, utilities, transport and required debt payments. Wants include optional upgrades and leisure. Count extra debt repayment with savings and avoid counting it again as a need.
Planning
Budget Calculator — 50/30/20
Build a monthly household budget from take-home income. Compare needs, wants and savings with the 50/30/20 rule or your own target percentages.
Monthly amount left unallocated
$300.00
Total allocated
$4,700.00
Savings target
20%
Result comparison
Monthly amount left unallocated: $300.00Monthly amount left unallocated · $300.00
Total allocated: $4,700.00Total allocated · $4,700.00
Monthly amount left unallocatedTotal allocated
Monthly budget versus target
Detailed values use the same assumptions as the summary above.
| Category | Target % | Target amount | Actual allocation | Actual − target |
|---|---|---|---|---|
| Needs | 50% | $2,500.00 | $2,500.00 | $0.00 |
| Wants | 30% | $1,500.00 | $1,200.00 | -$300.00 |
| Savings / extra debt repayment | 20% | $1,000.00 | $1,000.00 | $0.00 |
The target split is a planning rule, not a spending requirement. Include each expense once and use a split that fits your circumstances.
Calculation method
Formula and method
With 5,000 take-home income, the default targets are 2,500 for needs, 1,500 for wants and 1,000 for savings. Actual allocations of 2,500, 1,200 and 1,000 leave 300 unallocated.
Detailed guide
Compare your monthly budget with a target
Start with take-home household income rather than gross salary. Total recurring essentials, discretionary spending, and savings or extra debt repayment. The result shows money left unallocated or a shortfall if the plan exceeds income.
The default 50/30/20 split sets aside half of net income for needs, 30% for wants and 20% for savings or extra debt repayment. Change the needs and wants percentages to fit your plan; the savings target is the remainder.
Formula and method
Target amount = monthly net income × target % / 100; unallocated = income − needs − wants − savings
With 5,000 take-home income, the default targets are 2,500 for needs, 1,500 for wants and 1,000 for savings. Actual allocations of 2,500, 1,200 and 1,000 leave 300 unallocated.
The table’s difference is actual minus target. A positive needs or wants difference means that category exceeds the chosen allocation. A positive savings difference means you are setting aside more than planned.
Using the results
Uneven income
For variable earnings, start with a conservative monthly estimate and revisit the budget as income arrives. Convert annual expenses into monthly amounts before adding them.
Frequently asked questions
Does 50/30/20 use gross or net income?
Use net take-home income available to spend or save after tax. Applying the split to gross pay overstates the available budget.
Can I change the percentages?
Yes. Enter needs and wants targets whose sum is at most 100%; savings receives the remainder.
What does a negative unallocated amount mean?
Your entered expenses and savings exceed monthly income. Reduce allocations or increase available income to close the gap.
Data sources
These sources explain the concepts used in the calculation. Check the applicable contract or issuer documents for your actual parameters.
Updated: October 1, 2026
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